BOISE, Idaho -

In the congressional fundraising horse race, Republican U.S. Rep. Mike Simpson says he outraised challenger Bryan Smith nearly four-to-one in 2013's final quarter.

Smith announced Thursday that he raised $111,066 in the fourth quarter. The money will go to his GOP primary election bid against Simpson, with the vote on May 20.

Meanwhile, Simpson says he brought in $430,000.

In total, Simpson says he raised more than $1.25 million in 2013, with Smith raking in $525,000, including his own money, since joining the race in June.

Smith says he's "overwhelmed by the support my campaign has received."

Simpson, an eight-term Republican going for his ninth, says he's got $760,000 in cash to pay for campaign materials as he tries to keep his job in the face of Smith's conservative challenge.