Republican support for U.S. presidential candidate Ted Cruz rose this week as voters keyed in on the senator from Texas as the top alternative to Donald Trump, according to a Reuters/Ipsos poll on Friday.Cruz had the support of 17 percent of likely Republican voters, behind Donald Trump, who remained the front runner with support of 31 percent of respondents in the five-day rolling poll.Last week, Cruz had the support of 10 percent of likely Republican voters and was relatively even with Ben Carson and Marco Rubio.Cruz has been gaining momentum nationally this month after polls showed him overtaking Trump in...