A Democratic candidate running in Kansas's special House election is touting the support of a group aligned with Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) ahead of Tuesday's vote.

James Thompson, who is running to fill the House seat vacated by now-CIA Director Mike Pompeo, wrote on Twitter on Friday that he was "proud to have the endorsement" of Our Revolution, a progressive political group that emerged out of Sanders's 2016 presidential campaign.

So proud to have endorsement of @OurRevolution. @BernieSanders proved PEOPLE power can beat big money. Help us win: https://t.co/gyGma3OeQu — James Thompson (@JamesThompsonKS) April 7, 2017

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Thompson is running against Kansas State Treasurer Ron Estes, a Republican, in a district that President Trump won in November by nearly 30 points.

Still, the race has grown unexpectedly tight in recent weeks amid a surge of Democratic energy in the district.

A number of high-profile Republicans are stepping in to help Estes's bid, including Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas), who is expected to make an appearance in the district on Monday.

Vice President Pence recorded a robocall urging Republicans to vote for Estes in the election on Tuesday, and Speaker Paul Ryan Paul Davis RyanAt indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates Peterson faces fight of his career in deep-red Minnesota district MORE (R-Wis.) reportedly sent out a "personal" fundraising plea to Republican donors on behalf of Estes.

Thompson's tweet was first highlighted by The Huffington Post.