Redskins hold on to beat Cardinals 21-19

In the final 30 seconds, the Arizona Cardinals used three quarterbacks, scored a touchdown, failed on a 2-point conversion, recovered an onside kick and barely — just barely — missed a 55-yard field goal. It was only after Neil Rackers’ kick sailed wide left that the Washington Redskins could take a deep sigh, digest all that happened and realize that, despite their effort, they had not quite…