Vulnerable Democratic Rep. Travis W. Childers gained his first official challenger Monday when Republican state Sen. Alan Nunnelee filed to run in Mississippi’s 1st District.

“We need somebody representing north Mississippi that will hold the Obama administration accountable,” Nunnelee said.

Nunnelee had been considering a campaign and this morning, according to news reports and confirmed by CQ Politics, he made it official and filed paperwork with the Federal Election Commission.