Looking for any more evidence that Senator Barack Obama is shifting from the primary to the general election? Check out where Mr. Obama is planning to campaign over the next two weeks.

On Wednesday, he is headed to Michigan – and not to Detroit but to Macomb County, which has long been synonymous with so-called Reagan Democrats. Michigan is a state that aides to Senator John McCain, the presumptive Republican nominee, see as highly competitive, given the number of blue-collar workers there and Mr. Obama’s difficulties in winning support from those voters in his contest with Senator Hilary Rodham Clinton.

In addition, Michigan is one of two states that held their primaries in defiance of Democratic Party rules, which meant that Mr. Obama did not campaign there, or build up an organization there.

And next week, Mr. Obama is spending three full days in the other state which held its primary in defiance of the Democratic Party – Florida. (He is also going tomorrow to another general election state, Missouri).

Mr. Obama’s aides were quick to say that no one should conclude from this that he is viewing his primary contest with Mrs. Clinton as completed: he is going to Oregon for two days this weekend. But they left no doubt that they were concerned with the head-start Mr. McCain was getting and didn’t want to leave him unattended.

“Our schedule reflects the fact that we are still fighting for votes and delegates in the remaining contests but also that we are going to places that are going to be competitive in the fall,” said Bill Burton. “John McCain has gone unchallenged for far too long and we’re going to make sure that voters in competitive states know the choice in this election between changing Washington and the third term of George Bush’s failed policies that McCain is offering.