WASHINGTON -- Texas Gov. Rick Perry and his top aides entered the Republican presidential primary with a set of beliefs about how changes in the electorate and in media have radically altered how a politician can communicate and shape a campaign.Reality bites.The Perry campaign's outlook in its first days was that Americans' concerns about the economy would make jobs the only issue that mattered and would render ineffective the type of attacks on non-economic issues used to sideline Republicans in the past.