'X Factor' Finalists Alex & Sierra Notch iTunes No. 1, Show Sales Potential

Thanks to covers of songs by A Great Big World, Sara Bareilles and Of Monsters and Men, the boyfriend-girlfriend duo are the buzz of season three. Couple and singing duo Alex & Sierra have made a name for themselves as one of the final four contenders on season three of X Factor, proving a clear connection with the viewing audience despite floundering ratings.  Indeed, it's the two's endearing love story and spot-on vocals that have delivered some of the show's strongest moments. Last week, the...