State Rep. Julie Hamos is set to join the Democratic primary for Rep. Mark KirkMark KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE's (R-Ill.) seat, adding another name to what looks to be a lengthy list of suitors.

It looks like, at this point, Democrats will have trouble avoiding a primary in a district that has trended Democratic in recent years. Already, state Sen. Michael Bond and 2006 and 2008 nominee Dan Seals are in the race, and many others are looking at it.

On the GOP side, the early focus seems to be on state Rep. Beth Coulson, who has promised a speedy decision.

Kirk recently announced that he is running for Senate, paving the way for one of the biggest House races in the country in his district.

The Democratic primary will probably only get bigger. Once two well-known candidates jump in, the floodgates seem to open. Plus, the is one of the most Democratic-performing districts still held by Republicans.