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1. People from political families have probably grown up with an interest in politics from a very young age.
2. People from political families often have inherited wealth, so don't need to work in regular jobs to earn a living, make car payments etc.
3. People from political families will often have social contacts with wealthy people who can raise funds for their political careers when the time comes.
4. Name recognition alone is a big factor in these days of political advertising on TV and "branding". Don't forget that the primary process is supposed to start in small states so as to give candidates who don't have widespread name recognition a chance to become known on the national stage. Hence, an early Florida primary would have been a huge advantage for a branded political product like H. Clinton versus the "black guy".