The National Republican Senatorial Committee is rescheduling when it
plans to run TV ads in support of Wisconsin Sen. Ron Johnson, pushing
back its reservation from August and September to the last three weeks
of the race.  

The news comes hours before the Wisconsin lawmaker plans to speak at
the Republican National Convention. Johnson is locked in a tough fight
against former Democratic Sen. Russ Feingold in a race Senate Democrats
consider one of their two best pickup opportunities this year.  

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An official at the NRSC confirmed that their ad buy had been delayed
but said it did not represent a finished commitment to Johnson’s campaign.  

“Our investment in Wisconsin is not changing, just the timing,” 
NRSC spokeswoman Andrea Bozek said.  

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Republican strategists have wondered whether Johnson, who spent $9
million of his own money on his 2010 campaign, would invest again in
his re-election race . That hasn’t stopped some GOP-aligned outside
groups from running ads in Wisconsin, however, including the Chamber of Commerce.