Original sentence: According to a CNN exit poll, Bush's support from African-Americans increased during his presidency from 9% of the black vote in 2000 to 11% in 2004.An increase in Ohio (from 9% to 16%, each ± about 5%) may have helped give the victory to Bush over Kerry
Edited sentence: A marginally significant increase in Ohio (from 9% to 16%, each ± about 5%) may have helped give the victory to Bush over Kerry.Bush obtained a statistically insignificant increase in support from African-Americans during his presidency.He only got 9% of the black vote in 2000, and he received 11% in 2004