A recent poll showed almost 1 in 10 likely Republican voters still don't know whether they'll pull the lever for Todd Tiahrt, Jerry Moran or one of two other candidates on the primary ballot Tuesday.
One reason for the indecision: Moran's and Tiahrt's records and positions on most issues are similar.
But there are differences that may help the undecided make a choice in the race for the Republican nomination for U.S. Senate.
Listed here are 10 important votes in the House since 2007 in which Tiahrt and Moran made different choices:
* Jan. 10, 2007: HR 2, a bill to raise the minimum wage to $7.25 an hour over a two-year period. Supporters said the wage had not been raised for years and an increase would help entry-level workers; opponents said an increase would cost jobs and improperly interfere with business. It passed 315-116. Tiahrt: No. Moran: Yes.
* Jan. 12, 2007: HR 4, a bill requiring the government to negotiate prices with drugmakers taking part in the Medicare prescription drug program. Supporters said it would lower prices for taxpayers and patients; opponents said it could make it harder to bring drugs to the market. It passed 255-170. Tiahrt: No. Moran: Yes.
* April 18, 2007: HR 1361, a bill designed to improve disaster relief programs at the Small Business Administration. Supporters said it would help the government respond more quickly to natural and man-made disasters; opponents said it would add to the deficit and might not work. It passed 267-158. Tiahrt: No. Moran: Yes.
* April 20, 2007: HR 1257, a bill requiring most public companies to hold a non-binding shareholder vote on executive pay. Supporters said it would keep executive pay increases in line; opponents said it was an improper government intrusion into business. It passed 269-134. Tiahrt: No. Moran: Yes.
* Jan. 17, 2008: HR 3524, a bill designed to rehabilitate severely depressed public housing. Supporters said it would improve housing options for the very poor; opponents said it would add to the deficit. It passed 271-130. Tiahrt: Yes. Moran: No.
* Feb. 7, 2008: HR 4137, a bill broadly aimed at lowering tuition and fees and loan costs at colleges. Supporters said it would make college more affordable; opponents said it was an unnecessary intrusion into the operation of state higher education institutions. It passed 354-58. Tiahrt: Yes. Moran: No.
* June 11, 2008: HR 6003, a bill reauthorizing federal spending for Amtrak. Supporters said it would pay for needed rail improvements; opponents said it would add to the deficit. It passed 311-104. Tiahrt: No. Moran: Yes.
* Jan. 14, 2009: HR 2, a bill reauthorizing the Children's Health Insurance Program and using a tobacco tax increase to pay for it. Supporters said it would provide health care to kids and cut down on smoking; opponents said it would add to the deficit and contribute to socialized medicine. It passed 289-139. Tiahrt: No. Moran: Yes.
* July 22, 2009: HR 2920, a bill from Democrats establishing a "pay as you go" law requiring new spending to be offset by cuts or tax increases. Supporters said it would help reduce the deficit; opponents said it would lead to bookkeeping tricks and tax increases they opposed. It passed 265-166. Tiahrt: No. Moran: Yes.
* Nov. 4, 2009: HR 3639, a bill that moved up implementation of a bill regulating credit card companies. Supporters said consumers needed the protections because the bill gave too much power to credit card providers; opponents said banks would not be able to meet the schedule and that consumers would be hurt in the long run. It passed 331-92. Tiahrt: No. Moran: Yes.