Hillary Clinton joins vaccination debate on Twitter using hashtags #vaccineswork,

Hillary Clinton, the leading likely Democratic contender for the party nomination in 2016, couldn't resist taking a dig at the GOP hopefuls on Twitter.

"The science is clear: The earth is round, the sky is blue, and #vaccineswork. Let's protect all our kids. #GrandmothersKnowBest."

READ MORE: http://www.foxnews.com/politics/2015/02/03/chris-christie-rand-paul-under-fire-for-vaccine-remarks/