Senate Democrats’ campaign arm is going  back on air in Kentucky with new ads in support of nominee Alison Lundergan Grimes.

A Democratic Senatorial Campaign Committee official confirmed to Fox News on Wednesday that they would go up with new ads – a week after the DSCC initially stopped spending on TV time in the race against Senate Republican Leader Mitch McConnell.

Politico first reported that the group is reserving $650,000 in airtime after recent polling apparently indicated Grimes’ chances of unseating McConnell are improving. A source reportedly said the polling suggests independent voters may be moving toward Grimes.  

A week ago, Grimes was under fire for repeatedly declining to say – at a debate and other forums – whether she voted for President Obama. Democratic organizations, meanwhile, were channeling their campaign funding elsewhere.

But big-name Democrats, including Bill and Hillary Clinton, continue to stump for Grimes. A poll this week from SurveyUSA shows the two candidates neck-and-neck in the race – with McConnell at 44 percent and Grimes at 43 percent. 

McConnell's campaign, though, sent out a memo on Wednesday citing Voter Consumer Research polling showing McConnell with an 8-point lead over Grimes among likely voters.

Fox News’ Chad Pergram contributed to this report.