<Ul> <Li> Michael Bloomberg, Mayor of New York City 2002--2013 </Li> <Li> Tim Cook, business executive, industrial engineer, and developer from California </Li> <Li> John Hickenlooper, Governor of Colorado since 2011; Mayor of Denver 2003--2011 </Li> <Li> John Kasich, Governor of Ohio since 2011; U.S. Representative 1983--2001; candidate for President in 2000 and in 2016 </Li> <Li> Bernie Sanders, U.S. Senator from Vermont since 2007; U.S. Representative 1991--2007; candidate for President in 2016 </Li> <Li> Joe Scarborough, U.S. Representative from Florida 1995--2001 </Li> <Li> Mark Zuckerberg, computer programmer and Internet entrepreneur from California </Li> </Ul> <Li> Michael Bloomberg, Mayor of New York City 2002--2013 </Li> <Li> Tim Cook, business executive, industrial engineer, and developer from California </Li> <Li> John Hickenlooper, Governor of Colorado since 2011; Mayor of Denver 2003--2011 </Li>

When do candidates announce they are running for president