<p>You could apply, but chances of admission depend on a number of considerations. You might have better chances applying to an MA program first.
Some considerations relevant to your prospects of admission:
-Do you have undergrad history courses in which you performed well? Are these courses in your proposed history specialty?
-Do you have relevant languages for your proposed history specialty?
-Do you have a very good extended writing sample?
-What are your reasons for switching to history?
-Can your bring special perspectives or analytic tools to bear on historical problems (e.g., statistics)?
-Are your areas of interest in political science relevant to one or more of the history specialties? (e.g., international relations for diplomatic or military history; an area studies focus; history of political thought for intellectual history; etc.)
-What reading have you done in history?</p>
<p>[Guide</a> to Graduate School in History](<a href=“Division of Information Technology”>Division of Information Technology)
[Switching</a> Fields for Graduate Study](<a href=“http://gradschool.about.com/od/choosingaprogram/f/switch.htm]Switching”>Applying to Go to Graduate School for a Different Major)</p>