WASHINGTON — Two months before the election, President Obama and Mitt Romney agree on one thing: the collection of states where the race will be decided.

As Mr. Obama opened a two-day bus tour of Florida on Saturday, Mr. Romney set his sights on trying to put Virginia back in the Republican column. Television advertisements from both sides were filling the airwaves in those two vital states and six others from Nevada to New Hampshire, while outside groups supporting the candidates tested for traction elsewhere.

With the political conventions over, the battle to determine whether Mr. Obama will win re-election or Mr. Romney will become the 45th president of the United States is fully engaged. The race has been deadlocked, according to many measures, and each side was predicting that it would see no lift from its convention. That seems to have been true in Mr. Romney’s case, while Mr. Obama’s aides were hopeful that new polls due out this week would prove them wrong.

But for now, Mr. Obama may hold a slight edge because the race remains essentially tied, which means voter disappointment has not turned into a resounding call for his defeat despite the challenging economic climate.