Maybe this will stop the silly post-convention panic among Republicans. When the Washington Post/ABC poll tells you there's been no convention bump for Barack Obama, you can pretty much take that to the bank. Their latest survey shows the likely-voter split in the presidential race right where we found it a fortnight ago, with Obama up one single point over Mitt Romney --- in a sample that favors the Democrats: Last weekÂ’s Democratic National Convention helped President Obama improve his standing against Republican Mitt Romney, according to a new Washington Post-ABC News poll, but did little to reduce voter concern...