"that could propel" is correct and usable in written English.
You can use it when you are referring to a possible force, energy, or action that could be used to move or motivate something. For example: "The team's enthusiasm and energy was inspiring - it was a force that could propel them to success."
The issue that could propel him into the campaign is not one on which candidacies normally rise or fall.
But cloud computing draws strength from forces that could propel it beyond the ranks of the also-rans.
On Wednesday, there were flashes of the traits that could propel the team to greatness, but just as many glimpses of the roadblocks that could hamper them.
However, under the bonnet of the two blocs, the mechanics that could propel one to No 10 are more complicated for Cameron than they are for Miliband.
British fans this afternoon will be hoping that he can clinch a famous triumph that could propel him there as the Moto2 world champion.
Zimbabwe's president, Robert Mugabe, is enjoying a surge of popularity that could propel him to victory in the country's next elections, an independent poll of voters' intentions suggests.
The diversity of delegates and experiences was designed to throw up opportunities for collaboration that could propel people's projects and ideas.
But for now, Mr. Chávez's victory is a decisive one that could propel him beyond the end of his current six-year term in 2013.
The Orioles are a super-store of talent that could propel others to October heights, and that must be some kind of torture for Orioles GM Dan Duquette.
Hypersonic travel that could propel people from London to Sydney in just two hours is one step closer to reality, following a successful test.
However, rather than being attached close to the abdomen, the fins are turned down and stretched out, looking like two feet that could propel the fish along the sea bed.
