Hillary Clinton's campaign and Bernie Sanders are exchanging Twitter burns

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Clinton Feeling the Pressure from Sanders

Former Secretary of State Hillary Clinton's presidential campaign and Sen. Bernie Sanders (I-Vermont) have exchanged a number of Twitter blows in recent days.

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Sanders in particular has launched some zingers. On Wednesday, the Vermont senator tweeted a photo of a handwritten note Clinton had apparently written to him back in 1993. The post was a thinly veiled jab at Clinton for ratcheting up attacks against his healthcare-policy agenda in the race.

"To Bernie Sanders with thanks for your commitment to real healthcare access for all Americans," the Clinton note read.

Both Clinton and Sanders have been publicly sparring as Clinton, the Democratic front-runner, has seen her lead over Sanders melt away both nationally and in the first two voting states. Clinton has also launched broadsides against Sanders for backing a bill that protected gun manufacturers.

On Monday, Sanders dug up a two-year-old tweet from John Podesta, Clinton's campaign chair, that backed a single-payer healthcare system. Sanders, a big supporter of single-payer healthcare, playfully offered Podesta a job on his campaign:

Podesta responded by torching Sanders' approach to healthcare policy.

On Wednesday, he continued the criticism:

At the end of last week, Sanders highlighted the fact that Clinton criticized President Barack Obama's position on guns during her 2008 primary campaign against him:

Meanwhile, the official Clinton campaign account "The Briefing" has also been hammering away at Sanders:

See photos of the pair duking it out:

9 PHOTOS
Bernie Sanders and Hillary Clinton duking it out during Democratic debates
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Hillary Clinton's campaign and Bernie Sanders are exchanging Twitter burns
MILWAUKEE, WI - FEBRUARY 11: Democratic presidential candidate Senator Bernie Sanders (L) and Hillary Clinton participate in the PBS NewsHour Democratic presidential candidate debate at the University of Wisconsin-Milwaukee on February 11, 2016 in Milwaukee, Wisconsin.The debate is the final debate before the Nevada caucuses scheduled for February 20. (Photo by Win McNamee/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidates former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) during their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries. (Photo by Justin Sullivan/Getty Images)
LAS VEGAS, NV - OCTOBER 13: Democratic presidential candidates Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate. (Photo by Joe Raedle/Getty Images)
Senator Bernie Sanders, an independent from Vermont, left, and Hillary Clinton, former U.S. secretary of state, participate in the first Democratic presidential debate at the Wynn Las Vegas resort and casino in Las Vegas, Nevada, U.S., on Tuesday, Oct. 13, 2015. While tonight's first Democratic presidential debate will probably lack the name-calling and sharp jabs of the Republican face-offs, there's still potential for strong disagreements between the party's leading contenders. Photographer: Josh Haner/Pool via Bloomberg
LAS VEGAS, NV - OCTOBER 13: Democratic presidential candidates U.S. Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton shake hands at the end of a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate. (Photo by Joe Raedle/Getty Images)
LAS VEGAS, NV - OCTOBER 13: Democratic presidential candidates U.S. Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate. (Photo by Joe Raedle/Getty Images)
LAS VEGAS, NV - OCTOBER 13: Democratic presidential candidates U.S. Sen. Bernie Sanders (I-VT) (L) and Hillary Clinton take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate. (Photo by Joe Raedle/Getty Images)
LAS VEGAS, NV - OCTOBER 13: (L-R) Democratic presidential candidates U.S. Sen. Bernie Sanders (I-VT), Hillary Clinton and Martin O'Malley take part in a presidential debate sponsored by CNN and Facebook at Wynn Las Vegas on October 13, 2015 in Las Vegas, Nevada. Five Democratic presidential candidates are participating in the party's first presidential debate. (Photo by Joe Raedle/Getty Images)
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