Matt Terrill: former campaign manager for Marco Rubio on the ongoing US midterm race - Heather du Plessis-Allan Drive

Republicans in the US aren't breaking out the champagne yet.

Audiences hoping TV anchors will tell them who'll control the Senate are still waiting - but the Republicans seem likely to have won the House of Representatives.

The Senate could come down to a December run-off election, in Georgia.

Matt Terrill is a former campaign manager for Republican Marco Rubio.

He says some of the Senate races are much tighter than expected.

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