WASHINGTON, Jan 5 (Reuters) - Wiping back tears as he remembered children killed in a mass shooting, President Barack Obama on Tuesday ordered stricter gun rules that he can impose without Congress and urged American voters to reject pro-gun candidates. Obama made it clear he does not expect gun laws to change during his remaining year in office, but pledged to do what he can to make gun control a theme in the months leading up to the November election to replace him. In a powerful address in the White House, surrounded by family members of people killed in shootings,...