Race or Gender: Which is the bigger barrier?

With a woman and an African-American as the two remaining Democratic candidates for President, there has been much talk about the obstacles that both femals and African-Americans have had to overcome throughout history. Many people would probably argue that race relations have etched a much deeper scar into this nation's surface. Slavery persisted in this country until 1865, and even then there was a shift from chattel slavery to wage slavery during the Reconstruction era. While African-Americans had to endure slavery, (white) women did not face quite as extreme discrimination.

On the other hand, look at the times at which official voting rights were granted to each of these respective groups. African-Americans received the right to vote after the 15th Amendment was passed. Women, however, did not receive this same right until 1920, over a half-century later. So while the initial conditions of servitude endured by slaves were worse, they actually gained equal voting rights much faster than women did.
Throughout this election, there have been remarks made by people in the media and even by other politicians that seemed to attach negative connotations with the fact that Hillary Clinton is a woman. At the same time, any hint of racism towards Barack Obama has been generally looked down upon and taken as a much more severe offense than any anti-feminist remarks or gender discriminatory commentary about Senator Clinton. Does the fact that people can get away with snide remarks about Hillary's womanhood while Obama's "blackness" remains off limits point to gender as being a more difficult barrier to be overcome in this country? Or is the fact that racist remarks are taken with more severity point to the fact that racism is still a more sensitive issue and a more prevalent problem in American society? I would venture to guess that much of this might have to do with the fact that there generally have not been as many hate groups such as the KKK directed towards woman. While women are often seen as inferior and have been throughout American history, they have not suffered the same kind of individual hate speech as African-Americans have. So what remains the more sensitive issue, and which issue is the one where the least progress has been made?