The nonpartisan Cook Political Report on Friday moved the Dallas-area House district represented by Rep. Pete Sessions Peter Anderson SessionsThe Hill's Campaign Report: New polls show Biden leading by landslide margins The Hill's Morning Report - Presented by Argentum - In Rose Garden, Trump launches anti-Biden screed Pete Sessions wins GOP runoff in comeback bid MORE (R-Texas) to a "toss-up" in its ratings of top races.

Sessions's suburban Dallas district could be ripe for a tough challenge from Democrats, especially since the district voted for Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in 2016.

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Pointing to polling data shared with the group, Cook argued that Sessions, the chairman of the House Rules Committee, is "at the moment, the most vulnerable incumbent in the Lone Star State."

His opponent in this year's election, civil rights attorney and former NFL player Colin Allred, won the Democratic runoff with 70 percent of the vote. Allred raised $1 million during the primary phase and has $262,000 in cash on hand.

Democrats are expected to heavily invest in the seat — the House Majority PAC, the super PAC aligned with Democratic efforts to flip the House, has already booked more than $2 million in television advertising time in Dallas.

Meanwhile, Sessions had $1.5 million in his bank account as of the end of March. While Sessions himself hasn't had to run a tough race in more than a decade, he previously chaired the National Republican Congressional Committee and is expected to receives strong financial backing from the party.

Sessions is one of a number of Republican incumbents who face tough reelection races this year in Texas. Democrats are mounting credible challenges against Reps. John Culberson John Abney Culberson2020 Democratic Party platform endorses Trump's NASA moon program Bottom line Ex-Rep. Frelinghuysen joins law and lobby firm MORE (R) and Will Hurd William Ballard HurdHillicon Valley: Oracle confirms deal with TikTok to be 'trusted technology provider' | QAnon spreads across globe, shadowing COVID-19 | VA hit by data breach impacting 46,000 veterans House approves bill to secure internet-connected federal devices against cyber threats House Democrats' campaign arm reserves .6M in ads in competitive districts MORE (R) as well.

Democrats currently hold a 6-point advantage over Republicans on a generic House ballot, according to a poll from the left-leaning Public Policy Polling released this week.