Simple past tense and past participle of contest.(verb)
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Use "contested" in a sentence
"Across the country, polls show Republican candidates leading in contested races by campaigning against the Bush administration's bank bailout, Democrats 'massive economic stimulus package, President Obama's health-care overhaul and other examples of what the GOP terms "runaway spending.""
"The nonprofit he advises, Crossroads GPS, has poured tens of millions of dollars into advertisements in contested Senate races around the country, and a new report Thursday suggests it will spend another $50 million on House races in the next three weeks."
"For example, last Saturday the Democratic Congressional Campaign Committee (DCCC) had a National Day of Action that engaged volunteer-staffed canvasses in contested Congressional Districts across the country."