\begin{table}[htbp] 
\centering 
\caption{\bf Within-Pool Comparisons: NP-Score of State Legislators Who Win Primary or General Elections vs. Others (Threshold to Define Pools = 25 Percent)} 
\label{tbl_main_regressions_win_prim_genl_25} 
\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 
\multicolumn{7}{l}{\textit{Primary Election Winners vs. Others in Pool}} \\ [0.01in] 
All pools              & -0.033 & (0.026) & [2645] & ~~0.102 & (0.023) & [3690] \\ [.01in] 
Safe districts         & -0.046 & (0.029) & [1044] & ~~0.162 & (0.033) & [2114] \\ [.01in] 
Competitive districts  & -0.022 & (0.042) & [874] & ~~0.054 & (0.033) & [1173] \\ [.01in] 
\midrule 
\multicolumn{7}{l}{\textit{General Election Winners vs. Others in Pool}} \\ [0.01in] 
All pools              & -0.039 & (0.027) & [1358] & ~~0.130 & (0.035) & [2035] \\ [.01in] 
Safe districts         & -0.049 & (0.029) & [1013] & ~~0.169 & (0.038) & [1554] \\ [.01in] 
Competitive districts  & -0.019 & (0.065) & [285] & ~~0.023 & (0.059) & [475] \\ [.01in] 
\bottomrule 
\end{tabular} 
\end{table} 
