\begin{table}[htbp] 
\centering 
\caption{\bf Within-Pool Comparisons: NP-Score of State Legislators Who Run vs. Those Who Do Not, DV = Dummy of Ideology Relative to Pool} 
\label{tbl_main_regressions_run_33_dummy2} 
\begin{tabular}{lcccccc} 
\toprule\toprule 
& \multicolumn{3}{c}{Democrats} & \multicolumn{3}{c}{~Republicans} \\ [.05in] 
Sample                 & Coeff.  & Std. Error  &  \# Obs.  & ~~Coeff.  &  Std. Error  &  \# Obs.  \\ [.01in] 
\midrule 
All pools              & -0.025 & (0.033) & [3878] & ~~0.179 & (0.038) & [5973] \\ [.01in] 
Open seats             & -0.036 & (0.043) & [2094] & ~~0.165 & (0.043) & [2991] \\ [.01in] 
Safe districts         & -0.088 & (0.042) & [1704] & ~~0.179 & (0.052) & [3352] \\ [.01in] 
Competitive districts  & 0.081 & (0.073) & [1167] & ~~0.204 & (0.048) & [2056] \\ [.01in] 
\bottomrule 
\end{tabular} 
\end{table} 
