It sounds as if you are in Ohio. Does Ohio have run-off elections if no one receives 50%? If not, it sure won’t help if multiple challengers run against Boner.
I am in Ohio, in Boehner’s district. I have never heard of a run-off election, so if there are more than two actually on the ballot and one fails to gain a majority, the one with a plurality will “win” and be the candidate in the general election.
When it comes time for the election, any opposition candidates best decide which among them has the best chance and the others drop out. I personally don’t see any of the others who have announced having a chance against Boehner, and its definitely a long shot. What will be interesting is if Democrats cross over as their candidate has no chance in this district - they could come over if there was a viable candidate just to knock Boehner out at the primary level - not recognizing that they may just get what they “asked for” - a real conservative.
Runoffs are only in TX, OK, AR, LA, MS, AL, GA, and SC, and possibly NC if no one gets over 40 percent in the first round.