Reps. Adam Kinzinger (R-Ill.) and Don Manzullo (R-Ill.) are tied in their race with less than one week until the primary, according to a new poll from We Ask America.

Manzullo has 43 percent support in the poll, while Kinzinger has 42 percent. That's a major reversal from the last time the pollster looked at the race: In a poll released Feb. 21, Kinzinger led Manzullo by a 13-point margin, 47 percent to 34. The poll indicates that Manzullo has momentum in the race.

Kinzinger, a freshman and rising star in the GOP, opted to challenge Manzullo, a longtime congressman, after Kinzinger's district was dismantled by a Democratic gerrymander.

The race has turned into a proxy war between the Tea Party and establishment Republicans: Kinzinger is backed many congressmen and local legislators, including House Majority Leader Eric Cantor (R-Va.), while Manzullo has the support of local and national Tea Party and conservative groups that have been angered by Kinzinger's more centrist voting record.

The automated poll of 1,605 likely Republican primary voters was conducted from March 11-12 and has a margin of error or plus or minus 2.4 percent.

The primary is next Tuesday.