A Republican state Senator is weighing a campaign against Rep. Leonard Boswell (D) in the 3rd district, in and around Des Moines.

Brad Zaun, who won a second four-year term to the state Legislature in 2008, told IowaPolitics.com that he is “taking a serious look at it— and that he’ll make a decision in the next two to three weeks.

Zaun is a former mayor of Urbandale, a Des Moines suburb.

Boswell, 75, won a seventh term last year with 56 percent of the vote against Kim Schmett (R), a former Congressional aide. Boswell faced his toughest re-election race in 2006, when he beat state Sen. Jeff Lamberti (R) by 5 points.

At the moment, the only GOP challenger to have filed paperwork to challenge Boswell is Dave Funk, a pilot who has raised little money for his 2010 campaign. A decision is expected soon from Mike Mahaffey, a former state GOP chairman who narrowly lost to Boswell in 1996, when the 3rd district had a more rural configuration.