Immigration Ad Ties McCain to Limbaugh
Nick Timiraos reports from Las Vegas on the presidential campaign.

Immigration is flaring up again in the presidential campaign, and Barack Obama on Wednesday released a new advertisement that tries to tie John McCain to his longtime critic, Rush Limbaugh.

After a primary campaign where Obama and McCain proposed to get tough on border security, the candidates this time are attacking each other for failing to secure an immigration deal that would have given illegal immigrants a path to citizenship. The rapid turnabout comes as both candidates court Hispanic voters in key southwestern battlegrounds.

“They want us to forget the insults we’ve put up with, the intolerance,â€