Totally reasonable, but that is not in the law of the state of Illinios. Illinois has a very liberal residency law.
No argument from this corner. Keyes is well within his rights according to Illinois law. If I were a resident of Illinois I would vote for Keyes over an acknowledged liberal(Obama).
I do have reservations about the manner in which his selection came about. I agree with many that Illinois should not have been in the position to seek help outside of the state.
Keyes enters this race not as first choice, nor as second. Ditka's flirtation with a Senate run sapped the brief Republican momentum that had been building at rumor he would enter. Obama was considered to have come off a successful speech on a national stage. Keyes is not a resident of Illinois and enters the race only a few months before the general election. He will have to contend with his own words about H. Clinton.
These are the realities he faces.
I'm in favor of Obama being defeated, though have my doubts given the above as to Keyes chances. It'll be interesting to observe the reaction of the residents of Illinois to this newest development in the race for the Senate.