A few suggestions,

No Obama, what a bummer!

Down the drain with John McCain.

Get on the J train, vote McCain...( the author does not necessarily endorse his own slogans).

Get da black man in da whitehouse!...( walking the fine line of offending U.S sensibilities here but stick ya tongue in yer cheek and work with me..' There goes the neighbourhood Martha!')

Black by day, white(house) by night.

Go round again with John McCain.

p.s Relax people ( breathe in, breathe out) I know already, "get my upside down arse( yes, ass) the hell out of OUR election!"

Change We Can Buy Gum With

ObamaNation

Barack the Vote

Vote McSame

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Flip A Coin.

Both Parties are Criminal Organizations.

So make it transparent: Heads, Obama- Tails, amabO.

McCain is wobbly, but I can still walk.