You might say that, but let's look at the bottom, say, 10 states by average per capita income and who they went for in the last two elections.
https://en.wikipedia.org/wiki/List_of_U.S._states_by_income
2008 election (using 2007 income data)
50. Mississippi -- McCain
49. West Virginia -- McCain
48. Arkansas -- McCain
47. Kentucky -- McCain
46. Alabama -- McCain
45. Oklahoma -- McCain
44. Idaho -- McCain
43. Tennessee -- McCain
42. Louisiana -- McCain
41. South Carolina -- McCain
2012 election (using 2010 income data)
50. Mississippi -- Romney
49. West Virginia -- Romney
48. Arkansas -- Romney
47. Kentucky -- Romney
46. Alabama -- Romney
45. Tennessee -- Romney
44. Louisiana -- Romney
43. New Mexico -- Obama
42. South Carolina -- Romney
41. Oklahoma -- Romney
Now, that's not ironclad, but that's pretty interesting that the states where people
earn the least money have gone for the Republican -- you know, the one that people with low incomes wouldn't vote for because they're dependent on government and all that -- almost exclusively for the past two election cycles.