Democrats are back on the air in Arkansas, attacking Senate candidate Rep. Tom CottonTom Bryant CottonTim Scott sparks buzz in crowded field of White House hopefuls Opposition to refugees echoes one of America's most shameful moments White House defends CDC outreach to teachers union MORE (R) as a "politician we just can't trust."

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The latest ad, backed by a $150,000 TV buy from the pro-Democratic super-PAC Patriot Majority, attacks Cotton as a pawn of Wall Street.

"The real Tom Cotton? Just scratch the surface," the ad's narrator says as Cotton's face is shown on a scratch-off lottery ticket. "Cotton made hundreds of thousands of dollars working for corporate interests. In Congress he takes their campaign cash, luxury trips around the country, and then backs their schemes: Privatizing social security, gambling it on Wall Street, pledging to keep tax breaks that ship jobs overseas. The real Tom Cotton? A politician we just can't trust."

Cotton and Sen. Mark PryorMark Lunsford PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas MORE (D-Ark.) are locked in a tough race in conservative Arkansas. Both sides have been spending heavily on TV ads for months. Polls show it's a close contest.