Democratic Rep. Carol Shea-Porter’s 2010 re-election bid just got complicated.

Republican Frank Guinta, mayor of Manchester, filed paperwork with the Federal Election Commission to run in New Hampshire’s 1st District.

Guinta recently announced he would not seek re-election as mayor and was mulling a run for federal office in 2010. But Guinta has not publicly announced whether he will run for the open Senate seat or for the 1st Congressional District seat.