The United States was proud to play a decisive role, especially in the early days, and then in a supporting capacity.

WHITEHOUSE: President Obama Salutes the People of Libya

The United States was proud to play a decisive role, especially in the early days, taking out Libyan air defenses and conducting precision strikes that stopped the regime in its tracks.

WHITEHOUSE: President Obama Speaks About the US-France Alliance

To take up this challenge, UNESCO has a decisive role to play.

UNESCO: THEMES

The committee has urged the government to set a deadline for coal-fired power stations to adopt CCS, which it says could play a decisive role in reducing carbon emissions.

BBC: Debate on carbon capture and storage

Both campaigns know that just a single electoral vote could play a decisive role in what's expected to be a historically close race, and that makes what happens in the event of an Electoral College tie all the more intriguing.

CNN: Electoral College tie possible in Obama-Romney race

In swing states like North Carolina which the Democrats consider so important that they have scheduled their 2012 National Convention there an individual donor, particularly one with access to corporate funds, can play a significant, and sometimes decisive, role.

NEWYORKER: State for Sale