This one is easy,
The House will have their vote, Holder (and obama) will ignore it, the MSM will either ignore it or cite it as more political noise by Republicans. Republicans will use it in fund-raising letters. Democrats will use it in fund-raising letters. Holder will still be attorney general in December. If Romney wins his AG will do nothing about it.
Republicans have no follow-up plan.
For my edification - what IS the next step after a contempt vote?
Is there no law enforcement avenue available other than impeachment?
The democrats & media couldn't help but play right into his hands, because they couldn't leave the charges unanswered - they'd go over the top, as usual.
And as inept as he's proven to be, the electorate is very much in the mood to find Obama guilty of something.