millions of dollars to help elect president obama back in 2008 may not be so genius with their generous this time around it appears. a rally in philadelphia demanding more support for workers rights. unions have long been backers. this year some top union leaders cried foul after the party chose to stage its convention in charlotte, north carolina. that state ranked dead last in the percentage of union members in its population according to feds. now some of those union officials say that while their votes may not change they are less likely to open up their wallets. shannon bream in d.c. tonight. shannon? >> shep, as the two parties gear up for the conventions, they are hoping will sway undecided voters, big labor isn't lining up to bank roll the democrats gathering in charlotte, north carolina. public records show the unions contributed $8.5 million to the 2008 democratic convention in denver. many are scaling way back or taking a pass entirely this time around. in a july memo to members,