Leaders in White House the reverse of smart in Washington — what's the downside? (3,3)

'what's the downside?' is the definition.

'leaders in white house the reverse of smart in washington' is the wordplay.
'leaders in' indicates taking the first letters.
'the reverse of' says the letters should be written backwards.
'smart in washington' becomes 'tony' (tony can mean smart or stylish in the US).
The first letters of 'white house' is 'wh'.
'tony' reversed gives 'ynot'.
'wh'+'ynot'='WHY-NOT'