Florida Governor Ron DeSantis, once the leading Republican rival to Donald Trump, ended his election campaign on Sunday and threw his support behind the former president. DeSantis’s withdrawal, after months of weakening support, leaves only low-polling Nikki Haley standing between Trump and nomination as the Republican Party’s candidate for the US presidential election in November. In a video message, DeSantis said that following his second place finish last week in the Iowa caucuses he could not ask “supporters to volunteer their time and donate their resources if we don’t have a clear path t…