There will be similar minor adjustments as time marches on to the next election. Bigger changes will occur when: Gallup publishes its party affiliations as of the end of 2012, Gallup publishes its approval ratings at the end of 2012, and statehouse and Congressional elections in the interim.
At this point, this measurement is really a measure of the strength of the state party. One might conclude that some states do not focus on the presidential election as much as the local elections. Pennsylvania and West Virginia are good examples. Pennsylvania has a predominately Republican House delegation, governor, state senate, and state house. It's a tossup in the Senate, party affiliation, and approval rating. Yet, Pennsylvania went for Obama.
West Virginia has Democratic Senate delegation, governor, state senate, and state house. The House delegation is Republican and Obama's approval rating is negative. Party affiliations are a toss up. Still, West Virginia voted for Romney.
Iowa is exactly 50%. The governor and state house are Republican. The state senate is Democratic. The House delegation, the Senate delegation, Obama's approval rating, and party affiliations are all tossups. Add in the vote for Obama and you have exactly 50%. The Hawkeye State prefers to keep things balanced so that government can't accomplish much of anything. Some would say that is the preferred result.